private void countAndMarkUnresolved(
      @NotNull VirtualFile file, @NotNull final Set<VirtualFile> result, final boolean inDbOnly) {
    if (file.isDirectory()) {
      VfsUtilCore.visitChildrenRecursively(
          file,
          new VirtualFileVisitor() {
            @Override
            public boolean visitFile(@NotNull VirtualFile file) {
              return doCountAndMarkUnresolved(file, result);
            }

            @Nullable
            @Override
            public Iterable<VirtualFile> getChildrenIterable(@NotNull VirtualFile file) {
              return inDbOnly ? ((NewVirtualFile) file).iterInDbChildren() : null;
            }
          });
    } else {
      doCountAndMarkUnresolved(file, result);
    }
  }